551491625664 has 504 divisors, whose sum is σ = 1970727059808. Its totient is φ = 146638356480.

The previous prime is 551491625653. The next prime is 551491625731. The reversal of 551491625664 is 466526194155.

It is a happy number.

551491625664 is a `hidden beast` number, since 5 + 5 + 1 + 4 + 9 + 1 + 625 + 6 + 6 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (504).

It is a self number, because there is not a number n which added to its sum of digits gives 551491625664.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 24007144 + ... + 24030104.

Almost surely, 2^551491625664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 551491625664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (985363529904).

551491625664 is an abundant number, since it is smaller than the sum of its proper divisors (1419235434144).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

551491625664 is a wasteful number, since it uses less digits than its factorization.

551491625664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23053 (or 23033 counting only the distinct ones).

The product of its digits is 7776000, while the sum is 54.

The spelling of 551491625664 in words is "five hundred fifty-one billion, four hundred ninety-one million, six hundred twenty-five thousand, six hundred sixty-four".